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27#include "udfdecl.h"
28
29#include <linux/string.h>
30#include <linux/errno.h>
31#include <linux/mm.h>
32#include <linux/slab.h>
33
34#include "udf_i.h"
35#include "udf_sb.h"
36
37
38static int udf_readdir(struct file *file, struct dir_context *ctx)
39{
40 struct inode *dir = file_inode(file);
41 struct udf_inode_info *iinfo = UDF_I(dir);
42 struct udf_fileident_bh fibh = { .sbh = NULL, .ebh = NULL};
43 struct fileIdentDesc *fi = NULL;
44 struct fileIdentDesc cfi;
45 int block, iblock;
46 loff_t nf_pos;
47 int flen;
48 unsigned char *fname = NULL, *copy_name = NULL;
49 unsigned char *nameptr;
50 uint16_t liu;
51 uint8_t lfi;
52 loff_t size = udf_ext0_offset(dir) + dir->i_size;
53 struct buffer_head *tmp, *bha[16];
54 struct kernel_lb_addr eloc;
55 uint32_t elen;
56 sector_t offset;
57 int i, num, ret = 0;
58 struct extent_position epos = { NULL, 0, {0, 0} };
59 struct super_block *sb = dir->i_sb;
60
61 if (ctx->pos == 0) {
62 if (!dir_emit_dot(file, ctx))
63 return 0;
64 ctx->pos = 1;
65 }
66 nf_pos = (ctx->pos - 1) << 2;
67 if (nf_pos >= size)
68 goto out;
69
70 fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
71 if (!fname) {
72 ret = -ENOMEM;
73 goto out;
74 }
75
76 if (nf_pos == 0)
77 nf_pos = udf_ext0_offset(dir);
78
79 fibh.soffset = fibh.eoffset = nf_pos & (sb->s_blocksize - 1);
80 if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
81 if (inode_bmap(dir, nf_pos >> sb->s_blocksize_bits,
82 &epos, &eloc, &elen, &offset)
83 != (EXT_RECORDED_ALLOCATED >> 30)) {
84 ret = -ENOENT;
85 goto out;
86 }
87 block = udf_get_lb_pblock(sb, &eloc, offset);
88 if ((++offset << sb->s_blocksize_bits) < elen) {
89 if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_SHORT)
90 epos.offset -= sizeof(struct short_ad);
91 else if (iinfo->i_alloc_type ==
92 ICBTAG_FLAG_AD_LONG)
93 epos.offset -= sizeof(struct long_ad);
94 } else {
95 offset = 0;
96 }
97
98 if (!(fibh.sbh = fibh.ebh = udf_tread(sb, block))) {
99 ret = -EIO;
100 goto out;
101 }
102
103 if (!(offset & ((16 >> (sb->s_blocksize_bits - 9)) - 1))) {
104 i = 16 >> (sb->s_blocksize_bits - 9);
105 if (i + offset > (elen >> sb->s_blocksize_bits))
106 i = (elen >> sb->s_blocksize_bits) - offset;
107 for (num = 0; i > 0; i--) {
108 block = udf_get_lb_pblock(sb, &eloc, offset + i);
109 tmp = udf_tgetblk(sb, block);
110 if (tmp && !buffer_uptodate(tmp) && !buffer_locked(tmp))
111 bha[num++] = tmp;
112 else
113 brelse(tmp);
114 }
115 if (num) {
116 ll_rw_block(READA, num, bha);
117 for (i = 0; i < num; i++)
118 brelse(bha[i]);
119 }
120 }
121 }
122
123 while (nf_pos < size) {
124 struct kernel_lb_addr tloc;
125
126 ctx->pos = (nf_pos >> 2) + 1;
127
128 fi = udf_fileident_read(dir, &nf_pos, &fibh, &cfi, &epos, &eloc,
129 &elen, &offset);
130 if (!fi)
131 goto out;
132
133 liu = le16_to_cpu(cfi.lengthOfImpUse);
134 lfi = cfi.lengthFileIdent;
135
136 if (fibh.sbh == fibh.ebh) {
137 nameptr = fi->fileIdent + liu;
138 } else {
139 int poffset;
140
141 poffset = fibh.soffset + sizeof(struct fileIdentDesc) + liu + lfi;
142
143 if (poffset >= lfi) {
144 nameptr = (char *)(fibh.ebh->b_data + poffset - lfi);
145 } else {
146 if (!copy_name) {
147 copy_name = kmalloc(UDF_NAME_LEN,
148 GFP_NOFS);
149 if (!copy_name) {
150 ret = -ENOMEM;
151 goto out;
152 }
153 }
154 nameptr = copy_name;
155 memcpy(nameptr, fi->fileIdent + liu,
156 lfi - poffset);
157 memcpy(nameptr + lfi - poffset,
158 fibh.ebh->b_data, poffset);
159 }
160 }
161
162 if ((cfi.fileCharacteristics & FID_FILE_CHAR_DELETED) != 0) {
163 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
164 continue;
165 }
166
167 if ((cfi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) != 0) {
168 if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
169 continue;
170 }
171
172 if (cfi.fileCharacteristics & FID_FILE_CHAR_PARENT) {
173 if (!dir_emit_dotdot(file, ctx))
174 goto out;
175 continue;
176 }
177
178 flen = udf_get_filename(sb, nameptr, lfi, fname, UDF_NAME_LEN);
179 if (flen < 0)
180 continue;
181
182 tloc = lelb_to_cpu(cfi.icb.extLocation);
183 iblock = udf_get_lb_pblock(sb, &tloc, 0);
184 if (!dir_emit(ctx, fname, flen, iblock, DT_UNKNOWN))
185 goto out;
186 }
187
188 ctx->pos = (nf_pos >> 2) + 1;
189
190out:
191 if (fibh.sbh != fibh.ebh)
192 brelse(fibh.ebh);
193 brelse(fibh.sbh);
194 brelse(epos.bh);
195 kfree(fname);
196 kfree(copy_name);
197
198 return ret;
199}
200
201
202const struct file_operations udf_dir_operations = {
203 .llseek = generic_file_llseek,
204 .read = generic_read_dir,
205 .iterate = udf_readdir,
206 .unlocked_ioctl = udf_ioctl,
207 .fsync = generic_file_fsync,
208};
209
